[F3.1] Finalize completion runbook, docs, and changelog

[metaphorics]

Question

Implement completion runbook + docs + changelog without exclusions, compatibility shims, or copied reference code.

Blocked by

• Close performance and formal correspondence

Spine anchor

Carmack — this leaf serves one bounded product obligation and one evidence ledger.

Acceptance

.outline/gates/F3.1.md reports every gate checked with current, non-pending evidence.